Results

White squares represent sample locations where VN4 was identified. Colors represent likelihood of occurrence of the VN4 strain ranging from 0 (blue) to 1.0 (red).

Fitted line for Geographic Distance vs. Genetic Distance for PB2 protein (2003-2007)

Geographic Distance vs. Genetic Distance,

by Protein (row) and Year (column)

Mantel tests to determine how genetic and geographic distance varied

Intra-regional (false) vs. Inter-regional (true) genetic distance measures by year